JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
153 
P. loitjiiiiclii Alex, is Neotropical. ( )ur very liinited knowledtre con- 
cerning the life-history of members of this genus is conlined to the 
American form and this information may be gi\en in the follow- 
ing pages. 
Pentiioptkra ALBiTARSis Osten Sacken. 
Pt'uthopWra albitarsh Osten Sacken; Mon. Dipt. N. Am., IV, 
257, 1869. 
The adult of this fly is well-known and has a wide distribution in 
the northeastern United States. This distribution so far as known 
to me, is as follows : 
rermont, Windham Co., Battleboro, July 15, 1908 (Johnson). 
Massachusetts, Middlesex Co., Weston, July 23, 1911 (Johnson) ; 
Plymouth Co., Plymouth, July 28, 1908 (Johnson). Connecticut, 
New London Co., New Loncion, Osten Sacken's type. New York, 
Fulton Co., Sacandaga Park, alt. 800 feet, June 28, 1911 (Alexan- 
cier) ; Woodworth's Lake, alt. 1650 feet, July 19, 1914 (Alexan- 
der) ; Tompkins Co., "The Glen," August 12, 1910 (Alexander)- 
Sept. 17, 1907 (Needham); Coy Glen, July 11, 1911 (Alexan- 
der); Bool's Brook, July 13, 1912 (Alexander). New Jersey, 
Essex Co., Hemlock Falls, June (Weidt) ; Warren Co., Delaware 
Water Gap, July 11 (Johnson) ; Camden Co., Clementon, Aug. 7, 
1892 (Johnson). Pennsylvania, (Cresson) Osten Sacken's type. 
rirginia, Southampton Co., Boykins, June 10, 1895 (Johnson); 
Nansemond Co., Suffolk, June 11, 1895 (Johnson); Fairfax Co., 
Pimmit Run, Sept. 6, 1908 (Knab). North Carolina, Buncombe 
Co., Black Mts., July 3, 1912 ( Beutenmuller) . Georcjia, Rabun 
Co., Tallulah Falls, June 21, 1909 (Bradley). 
From the above data it is seen that the fly is on the wing from 
June until September, being most abundant probably in July. The 
insects occur in cool, shady places and may be swept from the lux- 
uriant vegetation growing in such locations. 
The larva differs widely from the related Hexatomine genera in 
the habitat in which it dwells (in mud instead of sand and gravel) ; 
in the bright yellow coloration and in structural details; the man- 
dible with one very broad tooth at its middle, this tooth deeply split; 
stigmal field surrounded by four rather short lobes, each of the 
